CN112661076A

CN112661076A - Positioning and braking device of cargo lifting equipment

Info

Publication number: CN112661076A
Application number: CN202110287659.XA
Authority: CN
Inventors: 姚红伟; 李洹; 赵海涛; 童辛迪
Original assignee: Xinxiang Vocational and Technical College
Current assignee: Xinxiang Vocational and Technical College
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2021-04-16
Anticipated expiration: 2041-03-17
Also published as: CN112661076B

Abstract

The invention relates to a braking device, in particular to a positioning braking device of cargo lifting equipment. The technical problem to be solved is to provide a positioning brake device of the cargo lifting equipment, which has the advantages of falling prevention, brake action on a safety rope, high reliability and independent power supply. The technical scheme is as follows: the utility model provides a goods jacking equipment's location arresting gear, is including U type frame, lifter plate, fence frame, bearing rope, safety rope, battery etc. the lifter plate setting is on U type frame upside, and the fence frame sets up on the lifter plate, and four bearing ropes set up on the fence frame, and two blocks of battery settings are inboard at U type frame. The emergency braking mechanism is added into the device, when the braking mechanism has little locking effect on the safety rope, the emergency braking mechanism locks the safety rope for the second time, and performs double braking on the safety rope simultaneously, so that the device is higher in reliability compared with the prior art in which the motor part is braked.

Description

Positioning and braking device of cargo lifting equipment

Technical Field

The invention relates to a braking device, in particular to a positioning braking device of cargo lifting equipment.

Background

The high-altitude lifting mechanism such as a high-altitude material taking machine or a high-altitude operation platform comprises a machine base, a lifting mechanism and an operation platform, wherein the machine base is provided with a wheel walking device, and the high-altitude lifting mechanism lifts the operation platform to high altitude operation, so that the machine base is very little shaken or walked on the ground, and when the high-altitude lifting mechanism is conveyed to the operation platform at a high altitude position, the high-altitude lifting mechanism becomes very large displacement and inclination, light persons feel unsafe to workers, and when the high-altitude lifting mechanism is serious, the danger of overturning can occur.

The positioning and braking device has the advantages that the positioning and braking device has the advantages of falling prevention, high reliability and independent power supply, and brakes on the safety rope.

Disclosure of Invention

In order to overcome the defects that the safety of the high-altitude lifting mechanism for braking and braking the motor part is not high and the reliability of the device for installing dangerous braking on the sliding rail is not high in the prior art, the technical problem to be solved is as follows: the positioning and braking device of the cargo lifting equipment has the advantages of falling prevention, high reliability and independent power supply, and the brake acts on the safety rope.

The technical scheme is as follows: a positioning brake device of cargo lifting equipment comprises a U-shaped frame, a lifting plate, a rail frame, bearing ropes, safety ropes, batteries, a controller and a control panel, wherein the lifting plate is arranged on the upper side of the U-shaped frame, the rail frame is arranged on the lifting plate, four bearing ropes are arranged on the rail frame, at least one battery is arranged in the U-shaped frame, the controller is arranged on one side of the U-shaped frame close to the batteries, the controller is connected with a battery line, the control panel is connected with the controller through a lead, the control panel is arranged on external equipment, two ends of the safety ropes are fixed on the external equipment, the safety ropes penetrate through the U-shaped frame, the positioning brake device further comprises a positioning brake mechanism and a pulley assembly, the positioning brake mechanism is fixedly arranged on the inner side of the U-shaped frame, the positioning brake mechanism is connected with the controller line, the pulley assembly is arranged on the lower portion of the lifting plate, the pulley assembly is arranged on the inner side, the safety rope passes through the positioning brake mechanism.

Further, the positioning brake mechanism comprises a first support plate, a first motor, a first spur gear, a lead screw, a second spur gear, a first support and locking assemblies, wherein the first support plate is fixedly installed at the position, close to a left battery, of the inner side of the U-shaped frame, the first motor is fixedly installed on the first support plate, the first motor is connected with a controller circuit, the first spur gear is fixedly installed on an output shaft of the first motor, the two ends of the lead screw are rotatably installed on the inner side walls of the two sides of the U-shaped frame, the second spur gear is fixedly installed at the middle position of the lead screw, the second spur gear is meshed with the first spur gear, the two first supports are distributed at the bottom of the lifting plate, the two locking assemblies are symmetrically distributed on the two sides of the lead screw, and the two locking assemblies are respectively connected with the two first supports.

Furthermore, the locking assembly comprises an upper sliding plate, a sliding block, a lower sliding plate, a fixing plate and a guide rod, the upper sliding plate is connected with the first support in a sliding mode through two groups of symmetrical sliding blocks, the lower sliding plate is connected with a lead screw in a threaded mode, the upper sliding plate is in sliding contact with the lower sliding plate, the fixing plate is fixedly installed on one side of the lower sliding plate, one end of the guide rod is fixed to the side wall of the U-shaped frame, and the other end of the guide rod is connected with the fixing plate in.

Further, loose pulley assembly is including the second support, worker's word board, the screens frame, a bearing, first band pulley, third support and second band pulley, second support fixed mounting is in the middle of the bottom of lifter plate, two I-shaped boards set up respectively in second support both sides, two screens frames fixed mounting respectively are in the inboard of two worker's word boards, two sets of first band pulleys rotate through the bearing respectively and install between two sets of screens frames, two third supports set up the bottom at the lifter plate, two third supports pass the both sides of U type frame respectively, two sets of second band pulleys rotate through the bearing respectively and install on two third supports.

Further, the emergency brake device comprises an emergency brake mechanism, the emergency brake mechanism comprises a second support plate, a second motor, a third straight gear, rotating rods, a fourth straight gear, a fifth straight gear, a fourth support, rotary sensors and a brake assembly, four groups of second support plates are fixedly arranged at the bottom of the lifting plate, the second motor is fixedly arranged at the bottom of the lifting plate and is connected with a controller circuit, the third straight gear is fixedly arranged on an output shaft of the second motor, the two rotating rods are respectively and rotatably arranged on the two groups of second support plates, the two fourth straight gears are respectively and fixedly arranged at the middle positions of the two rotating rods and are meshed with two sides of the third straight gear, two fifth straight gears are respectively arranged at two ends of each rotating rod, two fourth supports are respectively arranged at one side of the bottom of the lifting plate close to the two fifth straight gears, one ends of the two rotary sensors are arranged on a U-shaped frame, the two rotation sensors are used for sensing the rotating speed of the first belt wheel and are connected with the controller through lines, the two brake assemblies are respectively arranged on the two fourth supports, and the safety rope penetrates through the inner sides of the brake assemblies.

Further, brake assembly is including fixed thread lock sleeve, locking hollow screw, the locking taper plate, spline housing and hollow gear, two fixed thread lock sleeve fixed mounting are in the bottom of fourth support, two locking hollow screw respectively with two fixed thread lock sleeve threaded connection, be equipped with the locking taper plate on the locking hollow screw, locking taper plate and fixed thread lock sleeve sliding contact, the inboard and two locking hollow screw threaded connection of spline housing, hollow gear sets up the one end at the spline housing, hollow gear and two fifth spur gear meshing.

Further, including anti-drop subassembly, anti-drop subassembly is including hex bolts and hexagon nut, four hex bolts respectively with two sets of screens frame threaded connection, four hex bolts and second support threaded connection, four hexagon nuts respectively with four hex bolts threaded connection.

The invention has the following advantages:

the anti-drop subassembly has been added to the brake mechanism in this device, when jacking equipment operated, through hexagon screw and hexagon nut's threaded connection for the position that hexagon screw connects I-shaped plate and screens frame is fixed, prevents because the part that the vibration leads to drops.

The emergency braking mechanism is added into the device, when the braking mechanism has little locking effect on the safety rope, the emergency braking mechanism locks the safety rope for the second time, and performs double braking on the safety rope simultaneously, so that the device is higher in reliability compared with the prior art in which the motor part is braked.

Meanwhile, batteries are arranged in the device for the first motor in the brake mechanism and the second motor in the emergency brake mechanism, the device has an independent power source, and the device can provide power in time when operating, so that accidents are reduced.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a first partial structure diagram of the three-dimensional structure of the present invention.

Fig. 3 is a second partial structure diagram of the three-dimensional structure of the present invention.

Fig. 4 is a schematic structural diagram of the positioning brake mechanism of the present invention.

Fig. 5 is a partial structural schematic diagram of the positioning brake mechanism of the present invention.

Fig. 6 is a schematic view of the sheave assembly of the present invention.

Fig. 7 is a partial structural view of the sheave assembly of the present invention.

Fig. 8 is a schematic structural diagram of the emergency braking mechanism of the present invention.

Fig. 9 is a first partial structure diagram of the emergency braking mechanism of the invention.

Fig. 10 is a second partial structure diagram of the emergency braking mechanism of the invention.

Fig. 11 is a schematic structural view of the anti-falling off assembly of the present invention.

Reference numerals: 1-U-shaped frame, 101-lifting plate, 1011-hurdle frame, 102-bearing rope, 103-safety rope, 104-battery, 105-controller, 106-control panel, 2-first support plate, 201-first motor, 202-first straight gear, 203-lead screw, 204-second straight gear, 205-first support, 206-upper sliding plate, 2061-sliding block, 207-lower sliding plate, 208-fixing plate, 209-guide rod, 3-second support, 301-I-shaped plate, 302-clamping frame, 3021-bearing, 303-first belt wheel, 4-third support, 401-second belt wheel, 5-second support plate, 501-second motor, 502-third wheel, 503-rotating rod, 504-fourth straight gear, 505-a fifth spur gear, 506-a fourth bracket, 5061-a fixed thread locking sleeve, 507-a locking hollow screw, 5071-a locking conical plate, 508-a spline sleeve, 5081-a hollow gear, 6-a hexagonal screw, 601-a hexagonal nut and 7-a rotation sensor.

Detailed Description

The invention is further illustrated by the following specific examples in which, unless otherwise explicitly stated and limited, terms such as: the arrangement, installation, connection are to be understood broadly, for example, they may be fixed, detachable, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

A positioning brake device of a cargo lifting device is disclosed, as shown in figures 1-3, and comprises a U-shaped frame 1, a lifting plate 101, a rail frame 1011, bearing ropes 102, a safety rope 103, a battery 104, a controller 105 and a control panel 106, wherein the lifting plate 101 is arranged on the upper side of the U-shaped frame 1, the rail frame 1011 is arranged on the left, right and rear three sides of the upper part of the lifting plate 101, the four bearing ropes 102 are arranged around the upper part of the rail frame 1011, two batteries 104 are arranged in the U-shaped frame 1, the controller 105 is arranged on the lower side in the U-shaped frame 1, the controller 105 is in line connection with the battery 104, the control panel 106 is connected with the controller 105 through a lead, the control panel 106 is arranged on an external device, the upper end and the lower end of the safety rope 103 are fixed on the external device, the safety rope 103 penetrates through the U-shaped frame 1, the positioning brake device and a pulley assembly are also included, the positioning brake device is fixedly arranged on, the pulley assembly is arranged at the lower part of the lifting plate 101, the pulley assembly is positioned at the inner side of the U-shaped frame 1, the safety rope 103 is wound on the pulley assembly, and the safety rope 103 penetrates through the positioning brake mechanism.

When external lifting equipment goes up and down, a worker stands on the lifting plate, when the U-shaped frame 1 moves to a specified position, a signal is transmitted to the controller 105 through the control panel 106, the battery 104 provides power for the controller 105, the controller 105 transmits the signal to control the external lifting equipment to stop operating, the bearing rope 102 stops going up and down, meanwhile, the positioning brake mechanism is started, the positioning brake mechanism locks the safety rope 103, the pulley assembly stops rotating, when the U-shaped frame 1 needs to go up and down again, the operation of the worker on the control panel 106 is operated, the controller 105 sends the signal, and the positioning brake mechanism removes the locking of the safety rope 103.

Example 2

On the basis of embodiment 1, as shown in fig. 4-7, the positioning brake mechanism includes a first support plate 2, a first motor 201, a first spur gear 202, a lead screw 203, a second spur gear 204, a first bracket 205, and locking components, the first support plate 2 is fixedly installed at a position close to the left battery 104 on the lower side inside the U-shaped frame 1, the first motor 201 is fixedly installed on the first support plate 2, the first motor 201 is connected with the controller 105 through a circuit, the first spur gear 202 is fixedly installed on an output shaft of the first motor 201, two ends of the lead screw 203 are rotatably installed on left and right side walls inside the U-shaped frame 1, the second spur gear 204 is fixedly installed at a middle position of the lead screw 203, the second spur gear 204 is engaged with the first spur gear 202, the two first brackets 205 are distributed on left and right sides of the bottom of the lifting plate 101, the two locking components are symmetrically distributed on left and right sides of the lead screw 203, the two locking assemblies are slidably connected to the two first brackets 205, respectively.

After the external lifting device moves to a specified position, when the bearing rope 102 stops lifting, the U-shaped frame 1 and the lifting plate 101 connected with the bearing rope also stop moving, a signal is sent to the first motor through the controller 105 manually, the first motor 201 is started, the first straight gear 202 fixedly connected with the output shaft of the first motor 201 rotates, the first straight gear 202 is meshed with the second straight gear 204 to drive the screw 203 to rotate, and the locking assembly connected with the screw 203 fastens and locks the safety rope 103.

The locking assembly comprises an upper sliding plate 206, sliding blocks 2061, a lower sliding plate 207, a fixing plate 208 and guide rods 209, the upper side of the upper sliding plate 206 is in sliding connection with the lower side of the first support 205 through two groups of symmetrical sliding blocks 2061, the lower sliding plate 207 is in threaded connection with the screw rod 203, the lower side of the upper sliding plate 206 is in sliding contact with the upper side of the lower sliding plate 207, the fixing plate 208 is fixedly arranged on the front side of the lower sliding plate 207, one ends of the two guide rods 209 are respectively fixed on the left side wall and the right side wall inside the U-shaped frame 1, and the inner ends of the guide rods 209 are.

When the first motor 201 is manually started through the control panel 106, after the power of the first motor 201 is transmitted to the lead screw 203, the lead screw 203 rotates, the lower sliding plate 207 moves outwards along the lead screw 203 along with the rotation of the lead screw 203, when the lower sliding plate 207 moves outwards, the upper sliding plate 206 in contact with the lower sliding plate 207 is jacked upwards, the sliding block 2061 fixedly connected with the upper sliding plate 206 moves upwards along the first bracket 205, the first bracket 205 is kept still, the lower side of the first bracket 205 is tightly attached to the upper side of the upper sliding plate 206, so that the middle safety rope 103 is locked, when the external lifting equipment continuously drives the lifting plate 101 and the U-shaped frame 1 to move through the bearing rope 102, the first motor 201 is manually sent a reverse rotation signal through the control panel 106 and the controller 105, the lead screw 203 is driven to reversely rotate through the first straight gear 202 and the second straight gear 204, so that the two lower sliding plates 207 move inwards at the same time, after the top force of the upper sliding plate 206 disappears by the lower sliding plate 207, the upper sliding plate 206 starts to move downward by its own weight, and does not closely contact with the first bracket 205, but a certain space is left, and at this time, the safety rope 103 starts to drive the pulley assembly to rotate, so that the U-shaped frame 1 can be smoothly lifted.

The pulley assembly comprises a second support 3, an I-shaped plate 301, clamping frames 302, a bearing 3021, a first belt wheel 303, a third support 4 and a second belt wheel 401, the second support 3 is fixedly mounted in the middle of the bottom of the lifting plate 101, the two I-shaped plates 301 are respectively arranged on the upper side and the lower side of the second support 3, the two clamping frames 302 are respectively fixedly mounted on the inner side between the two I-shaped plates 301, the two groups of first belt wheels 303 are respectively rotatably mounted between the two groups of clamping frames 302 through the bearing 3021, the two third supports 4 are respectively arranged on the left side and the right side of the bottom of the lifting plate 101, the third support 4 is positioned on the outer side of the first support 205, the two third supports 4 respectively penetrate through the left side and the right side of the U-shaped frame 1, and the two groups of second belt wheels 401 are respectively rotatably mounted on the two third supports 4 through.

When the lifting plate 101 and the U-shaped frame 1 are lifted and lowered by the load-bearing rope 102, the first pulley 303 and the second pulley 401, which are in contact with the safety rope 103, rotate together with the safety rope 103 by friction therebetween, thereby completing the transmission of the safety rope 103 inside the U-shaped frame 1.

Example 3

On the basis of embodiment 2, as shown in fig. 8 to 11, the emergency braking device further includes an emergency braking mechanism, the emergency braking mechanism includes a second supporting plate 5, a second motor 501, a third spur gear 502, a rotating rod 503, a fourth spur gear 504, a fifth spur gear 505, a fourth bracket 506, a rotation sensor 7 and a braking component, four sets of the second supporting plate 5 are fixedly installed at the left and right sides of the bottom of the lifting plate 101, the second motor 501 is fixedly installed at the middle position of the bottom of the lifting plate 101, the second motor 501 is connected with the controller 105 through a circuit, the third spur gear 502 is fixedly installed on the output shaft of the second motor 501, two rotating rods 503 are respectively rotatably installed on two sets of the second supporting plate 5 located at the same side of the second motor 501, two fourth spur gears 504 are respectively fixedly installed at the middle position of the two rotating rods 503, the two fourth spur gears 504 are engaged with two sides of the third spur gear 502, two fifth spur gears 505 are respectively arranged at two ends of each rotating rod 503, two fourth supports 506 are respectively arranged at the middle positions of the left side and the right side of the bottom of the lifting plate 101, one ends of two rotary sensors 7 are arranged on the U-shaped frame 1, the two rotary sensors 7 are used for sensing the rotating speed of the first belt wheel 303, the rotary sensors 7 are connected with a circuit of the controller 105, two braking assemblies are respectively arranged on the two fourth supports 506, and the safety rope 103 penetrates through the inner sides of the braking assemblies.

When the lifting device drives the U-shaped frame 1 to lift, a rotary sensor 7 is arranged inside the U-shaped frame 1, the rotary sensor 7 monitors the rotating speeds of two first belt wheels 303 positioned at the lower sides of two clamping frames 302, when the bearing rope 102 is suddenly broken and the U-shaped frame 1 is subjected to a zero-gravity condition, so that the safety rope 103 drives the first belt wheels 303 to rapidly rotate, when the two first belt wheels 303 rotate too fast, so that the rotating speed of the first belt wheels 303 reaches a safety critical value set by the rotary sensor 7, the rotary sensor 7 transmits a signal to the controller 105, the controller 105 responds to the signal, the second motor 501 is started, a third straight gear 502 fixedly connected with the second motor 501 rotates, two fourth straight gears 504 are meshed with the third straight gear 502 to drive the rotation of a rotating rod 503, a fifth straight gear 505 fixedly installed at the end part of the rotating rod 503 is meshed with a braking component, make the braking subassembly lock the safety rope 103 of inside, the dangerous emergence that drops is avoided along the slip of safety rope 103 to the compulsory prevention U shaped frame 1, and when the condition of emergency braking need be relieved, the operation workman passes to controller 105 with the signal through the operation to control panel 106, and the controller sends the signal to second motor 501 for second motor 501 reverse rotation, thereby make the braking subassembly relax the locking to safety rope 103.

The brake assembly is including fixed thread lock sleeve 5061, locking hollow screw 507, locking taper plate 5071, spline housing 508 and hollow gear 5081, two fixed thread lock sleeves 5061 fixed mounting are in the bottom left and right sides of fourth support 506, two locking hollow screws 507 respectively with two fixed thread lock sleeves 5061 threaded connection, be equipped with locking taper plate 5071 on the locking hollow screw 507, locking taper plate 5071 and fixed thread lock sleeve 5061 sliding contact, the inside left and right sides and two locking hollow screw 507 threaded connection of spline housing 508, hollow gear 5081 sets up the inner at spline housing 508, hollow gear 5081 meshes with two fifth spur gears 505.

After the power of the second motor 501 is transmitted to the fifth spur gear 505, a hollow gear 5081 fixed at one end of the spline housing 508 is meshed with the fifth spur gear 505 to drive the spline housing 508 to rotate, a tooth groove is arranged on the inner side of the spline housing 508, two locking hollow screws 507 contacting with the inner side of the spline housing 508 are meshed with the spline housing 508, along with the rotation of the spline housing 508, a thread part and a locking taper plate 5071 are arranged on the other side of each locking hollow screw 507, the thread part of each locking hollow screw 507 is meshed with a fixed thread locking sleeve 5061, so that the locking taper plate 5071 is pushed towards a small opening part of the fixed thread locking sleeve 5061, the locking taper plate 5071 is pressed inwards, the safety rope 103 penetrating through the middle part of the locking hollow screw 507 is clamped and locked, and the emergency braking on the U-shaped frame 1 is completed.

Still including anti-drop subassembly, anti-drop subassembly is including hex bolts 6 and hexagon nut 601, four hex bolts 6 respectively with two sets of screens frame 302 threaded connection, four

hex bolts

6 and 3 threaded connection of second support, four hexagon nut 601 respectively with four 6 threaded connection of hex bolts.

The U-shaped frame 1 can vibrate when lifted, so that parts are easy to fall off, the clamping frame 302 can be separated from the I-shaped plate 301, and the parts are damaged, therefore, the hexagon screws 6 are arranged between the I-shaped plate 301 and the clamping frame 302, and the hexagon nuts 601 are used for reversely fixing the hexagon screws 6, so that the clamping frame 302 is prevented from falling off from the I-shaped plate 301.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A positioning and braking device of cargo lifting equipment is characterized by comprising a U-shaped frame, a lifting plate, a rail frame, bearing ropes, safety ropes, batteries, a controller and a control panel, wherein the lifting plate is arranged on the upper side of the U-shaped frame, the rail frame is arranged on the lifting plate, the four bearing ropes are arranged on the rail frame, at least one battery is arranged in the U-shaped frame, the controller is arranged on one side, close to the batteries, of the U-shaped frame, the control panel is connected with the controller through a wire, the controller is connected with a battery circuit, the control panel is arranged on external equipment, two ends of each safety rope are fixed on the external equipment, the safety ropes penetrate through the U-shaped frame, the positioning and braking device further comprises a positioning and braking mechanism and a pulley assembly, the positioning and braking mechanism is fixedly arranged on the inner side of the U-shaped frame, the positioning and braking mechanism is connected with the controller circuit, the pulley assembly is arranged on the lower portion, the safety rope is wound on the pulley assembly and passes through the positioning brake mechanism.

2. The positioning and braking device of cargo lifting equipment according to claim 1, wherein the positioning and braking mechanism comprises a first supporting plate, a first motor, a first straight gear, the lead screw, the second straight-teeth gear, first support and lock the subassembly of dying, first backup pad fixed mounting is close to the position of left battery in the inboard of U type frame, first motor fixed mounting is on first backup pad, first motor and controller line connection, first straight-teeth gear fixed mounting is on the output shaft of first motor, the lead screw both ends are rotated and are installed on the both sides inside wall of U type frame, second straight-teeth gear fixed mounting is at the intermediate position of lead screw, second straight-teeth gear and first straight-teeth gear engagement, two first supports distribute in the bottom of lifter plate, two locks the subassembly symmetric distribution in the both sides of lead screw of dying, two locks the subassembly of dying respectively with two first support sliding connection.

3. The positioning and braking device of a cargo lifting device as claimed in claim 2, wherein the locking assembly comprises an upper sliding plate, a sliding block, a lower sliding plate, a fixing plate and a guide rod, the upper sliding plate is slidably connected with the first bracket through two symmetrical sets of sliding blocks, the lower sliding plate is in threaded connection with the lead screw, the upper sliding plate is in sliding contact with the lower sliding plate, the fixing plate is fixedly installed on one side of the lower sliding plate, one end of the guide rod is fixed on the inner side wall of the U-shaped frame, and the other end of the guide rod is slidably connected with the fixing plate.

4. The positioning and braking device of a cargo lifting device as claimed in claim 3, wherein the pulley assembly comprises a second bracket, I-shaped plates, clamping frames, bearings, first pulleys, third brackets and second pulleys, the second bracket is fixedly mounted in the middle of the bottom of the lifting plate, the two I-shaped plates are respectively disposed on the upper and lower sides of the second bracket, the two clamping frames are respectively fixedly mounted on the inner sides of the two I-shaped plates, the two first pulleys are respectively rotatably mounted between the two clamping frames through the bearings, the two third brackets are disposed on the bottom of the lifting plate, the two third brackets respectively pass through the two sides of the U-shaped frame, and the two second pulleys are respectively rotatably mounted on the two third brackets through the bearings.

5. The positioning and braking device of cargo lifting equipment according to claim 4, further comprising an emergency braking mechanism, wherein the emergency braking mechanism comprises a second supporting plate, a second motor, a third spur gear, a rotating rod, a fourth spur gear, a fifth spur gear, a fourth bracket, a rotation sensor and a braking component, four groups of the second supporting plate are fixedly arranged at the bottom of the lifting plate, the second motor is fixedly arranged at the bottom of the lifting plate and is connected with a controller through a circuit, the third spur gear is fixedly arranged on an output shaft of the second motor, two rotating rods are respectively rotatably arranged on two groups of the second supporting plate, two fourth spur gears are respectively fixedly arranged at the middle positions of two rotating rods, the two fourth spur gears are engaged with the two sides of the third spur gear, two fifth spur gears are respectively arranged at the two ends of each rotating rod, two fourth brackets are respectively arranged at the bottom of the lifting plate near one side of the two fifth spur gears, one end of each of the two rotary sensors is arranged on the U-shaped frame, the two rotary sensors are used for sensing the rotating speed of the first belt wheel, the rotary sensors are connected with the controller through lines, the two brake assemblies are respectively arranged on the two fourth supports, and the safety rope penetrates through the inner sides of the brake assemblies.

6. The positioning and braking device of the cargo lifting equipment according to claim 5, wherein the braking assembly comprises fixed thread locking sleeves, locking hollow screws, locking conical plates, a spline sleeve and a hollow gear, the two fixed thread locking sleeves are fixedly arranged at the bottom of the fourth support, the two locking hollow screws are respectively in threaded connection with the two fixed thread locking sleeves, the locking hollow screws are provided with the locking conical plates, the locking conical plates are in sliding contact with the fixed thread locking sleeves, the inner side of the spline sleeve is in threaded connection with the two locking hollow screws, the hollow gear is arranged at one end of the spline sleeve, and the hollow gear is meshed with the two fifth straight gears.

7. The positioning and braking device of the cargo lifting equipment according to claim 6, further comprising an anti-falling component, wherein the anti-falling component comprises a hexagon screw and a hexagon nut, the four hexagon screws are respectively in threaded connection with the two sets of clamping frames, the four hexagon screws are in threaded connection with the second bracket, and the four hexagon nuts are respectively in threaded connection with the four hexagon screws.